+1. This is supposed to be rendered in the subjunctive. What nerve a speaker would have to use the imperative with God.
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CharlieAug 7 '10 at 17:51

2

Yes, it's subjunctive with the "may" removed, certainly not imperative or addressed to God. Similar phrases with "May" dropped include, say, "Heaven help us", "The Devil take the hindmost", or "The Force be with you" (which I've not checked is actually present in the Star Wars corpus :p).
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ShreevatsaRAug 7 '10 at 18:13

3

They don't need "may" necessarily. I'd argue that the verb in these is in the subjunctive, though the "conjugation" isn't overt anymore. In the case of "the force be with you" or "the Holy Spirit be with you", "to be" I think is more clearly subjunctive.
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CharlieAug 7 '10 at 18:39

7

It is subjunctive, and there is no “may” which has been removed—it is simply a fixed idiom that comes from a time when the subjunctive could be freely used this way.
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nohat♦Aug 13 '10 at 19:18

1

In BE it would be "God Bless, America" in a condescending tone like a grandmother patting a small child
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mgbMay 17 '11 at 20:41

You'll notice you also say things like, "I'd rather that he leave early..." (not "leaves"). You are using the subjunctive mood, which isn't grammatically overt in English all that often, but does pop up here and there. "God bless America" is one of these cases.